Blower for portable rivet hearths or forges



W. WALKER. BLOWER FOR PORTABLE RIVET HEARTHS 0R FORGES.

Patented Oct. 26, 1920.

126% fiVE/VTOR.

per

APPLICATION FILED FEB. 4, 1919. RENEWED AUG. 20, 1920.

Wi'bzessesi I WILLIAM WALKER, or GLASGOW, SCOTLAND, assrerivon ro JOHN MAcnonALD & son

LIMITED, or MARYHILL, GLASGOW, SCOTLAND.

BLOWER r03 PORTABLE RIvE'r HEARTI-IS on nonens.

Specification of Letters Patent.

Application filed February 4, 1919, Serial No. 274,955 Renewed August 20, 1920. Serial No. 404,962;

cation. 7 V

This invent on relates to portable rivet hearths or forges.

Under this invention I combine with the portable rivet hearth or forge a compound blower comprising an atmospheric nozzle and a compressed air nozzle the jet issuing from the latter inducing a large volume of atmospheric air which is projected into the fuel in the rivet hearth or forge; i

The atmospheric nozzle which, for con venience, I will hereinafter refer to as the large nozzle is preferably made of cast,

iron and of somewhat bulbous formation with a wide atmospheric inlet at its outer end and a nipple part or mouth at lts lnner end this nipple part projecting over the hearth. At the back of the'large nozzle is a small nozzle which is supplied with compressed air the compressed .air blowing through the large nozzle and inducing a ourrent of atmospheric air.

the nipple part to the other side.

The compressed air nozzle may be pro- 'vided with a pipe connection having an air only partly shown the remainder of the hearthbeing broken away. 7 r Fig. 2 shows'the air pipe connection. Fig. 3 is a vertical cross section taken 'on the line 02, m, Fig. 1.

.The blower comprises a large nozzle a which is made in two parts, a bulbous part b and a nipple part ,0, these parts-having fiangesb 0 which are secured by screws m,

to the rim d of the rivet hearth d which .ters Patent is The bulbous part of the large nozzle is preferably secured to the one side of the rim of the hearth and is shown broken away. 02. is a hole'in the rim. It will be seen that the nipple part 0 is secured at the inside of the rim (Z and the part b at the outside. The part b, which has a narrow neck 6 is curved downward,

as shown at Fig. 3, and has a large atmospheric inlet 0 while the nipple. part 0 hasa narrow passage 7. At the back of the part a. is a small nozzle 9 which is preferably screwed in place and is coupled; by means of a coupling piece it, to' a knee i and airsupply'pipe j. The pipe j is supplied with compressed air under the control of a hand operated cock k. l

The compressed air issuing from the small 6 outlet Z in the nozzle 9 induces a current of atmospheric air through the large nozzle b, a. 7

Having now fully described my invention what I claim and desire. to secure by Let 1. The combination with a portable rivet hearth or forge of a compound blower com prising an atmospheric air nozzle made'in I two parts the one part of bulbous formation with narrow neck and flange and the other] part of nipple formation with flange, means for securing the flanges of the two parts to the rivet hearth or forge, a compressed air nozzle at the rear of and projecting into the atmospheric air nozzle and means for supplying compressed air to the con'lpressedair nozzle. 7 r

2. The combination with a portable rivet hearth of a compound blower comprising; an atmospheric nozzle secured to the rim of the hearth and made in two parts a nipple partand an air inlet part, the nipple part projecting over the hearth, and a compressed air nozzleprojectmg into the air inlet part.

In testimony whereof I atlix my sign-a ture in presence of two witnesses. I

.WILLIAM WALKER. Witnesses: i I i I WILLIAM FLEMING, KATE WALKER. 

